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Topic: Buoyancy

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In the News (Sat 25 May 19)

 Buoyancy - Wikipedia, the free encyclopedia
In physics, buoyancy is an upward force on an object immersed in a fluid (i.e.
Buoyancy is important for many vehicles such as boats, ships, balloons, and airships.
This is because the water is exerting on you a force called buoyancy.
en.wikipedia.org /wiki/Buoyancy   (790 words)

Buoyancy arises from the fact that fluid pressure increases with depth and from the fact that the increased pressure is exerted in all directions (Pascal's principle) so that there is an unbalanced upward force on the bottom of a submerged object.
Examination of the nature of buoyancy shows that the buoyant force on a volume of water and a submerged object of the same volume is the same.
Since the "water ball" at left is exactly supported by the difference in pressure and the solid object at right experiences exactly the same pressure environment, it follows that the buoyant force on the solid object is equal to the weight of the water displaced (Archimedes' principle).
hyperphysics.phy-astr.gsu.edu /hbase/pbuoy.html   (537 words)

 Buoyancy compensator - Wikipedia, the free encyclopedia
The diver's overall buoyancy and centre of buoyancy can routinely be adjusted by altering the volume of the gas in the BC, lungs and diving suit.
The attitude of a static and stable object in water, such as a diver, is determined by its centre of buoyancy and its centre of mass.
It is possible to make an unconscious diver float face up on the surface by placing buoyancy and weights so that the buoyancy raises the top and front of the diver's body and the weights act on the lower and back of the body.
en.wikipedia.org /wiki/Buoyancy_compensator   (1062 words)

The buoyancy is numerically equal to the weight of the fluid (air in the case of a balloon) displaced.
Buoyancy is a physical law that was discovered by the Greek mathematician and inventor Archimedes in the third century BC.
The principle, called Archimedes' principle, states that any body floating or submerged in a fluid (gas or liquid) is buoyed upward by a force equal to the weight of the displaced fluid.
www.centennialofflight.gov /essay/Dictionary/buoyancy/DI13.htm   (152 words)

 Buoyancy Particles
The size of the buoyancy force is proportional to the volume of liquid that it displaces, the force of gravity and the density of the liquid.
Buoyancy, on the other hand, acts at the center of buoyancy, and the center of buoyancy moves as the body tilts and rolls.
Buoyancy appears because there is a pressure differential between the bottom of an object and the top of an object.
www.cambrianlabs.com /Mattias/DelphiODE/BuoyancyParticles.asp   (2240 words)

As noted by Dodge, "buoyancy is taken to be the difference between the total water displacement of the sample and the displacement by the immersed parts of the nuts as they float.
The lift or buoyancy of the nut is registered as a negative number on the scale.
Hence the formula used in determining the buoyancy of the sample is: Total displacement in ml (=gm.) minus Weight of Sample in grams equals Buoyancy of Sample in grams.
aggie-horticulture.tamu.edu /carya/Manual/Buoyancy.html   (289 words)

It was not until Archimedes of Syracuse came along, that the theory of flotation and the buoyancy principle were defined.
Whether the story is true or not, there is no doubt to the truth of Archimedes understanding of buoyancy.
Archimedes was born at Syracuse on the island of Sicily in 287 BC.
www.engineering.usu.edu /jrestate/workshops/buoyancy/buoyancy.php   (1607 words)

 Howstuffworks "How Submarines Work"
As the submarine dives, the ballast tanks are flooded with water and the air in the ballast tanks is vented from the submarine until its overall density is greater than the surrounding water and the submarine begins to sink (negative buoyancy).
Unlike a ship, a submarine can control its buoyancy, thus allowing it to sink and surface at will.
When the submarine is on the surface, the ballast tanks are filled with air and the submarine's overall density is less than that of the surrounding water.
people.howstuffworks.com /submarine1.htm   (443 words)

 Neutral Buoyancy
Larry Krengel ===================================================== Neutral buoyancy means that the weight of an object under water is equal to the upward buoyant force of the water on the object.
By admitting water to their buoyancy tanks or blowing it out, a submarine can adjust the buoyant force until it just balances the total weight of the submarine.
----------------- A E. Buoyancy is the upward force on an object suspended in a fluid- a liquid or a gas.
www.newton.dep.anl.gov /askasci/phy00/phy00717.htm   (381 words)

 Oilfield Glossary: Term 'buoyancy'
Buoyancy can have significant effects over a wide range of completion and workover activities, especially in cases in which the wellbore and tubing string contain liquid and gas.
The buoyancy force is equal to the weight of fluid displaced by the object.
Any change in the relative volumes or fluid levels will change the buoyancy forces.
www.glossary.oilfield.slb.com /Display.cfm?Term=buoyancy   (80 words)

The buoyancy of an object is dependent on its density and the density of the material surrounding it.
The existence of such a lifting force is called buoyancy, or the tendency of an object to float in water" (Freeman).
Buoyancy acts as an opposite force to gravity and pushes the object up.
www.cord.edu /faculty/nelsons/ed337/miniunitsf01/buoyancy.html   (4798 words)

The principle of buoyancy is related to water's property of "uplift".
Gravity counters this effect by pulling the object down while the force of buoyancy is pushing the object up.
The students will use the scientific method to test the principles of density and it's relation to buoyancy.
student.biology.arizona.edu /sciconn/Sink_Float_lesson.html   (826 words)

 Bouyancy: Archimedes Principle
Since buoyancy is a force and not a mass, it must be converted to the proper units, which when multiplied by the acceleration of gravity (980 cm/s
This lesson is concerned with the second type, the type that are dependent on buoyancy.
If a cubic centimeter of aluminum was suspended in a fluid such as water with a very thin and negligible thread, the metal cube would have the fluid exerting pressure on the cube.
www.grc.nasa.gov /WWW/K-12/WindTunnel/Activities/buoy_Archimedes.html   (713 words)

There has been a considerable amount of discussion on buoyancy following Leo Blockley's drowning in the OULRC swamping accident in Amposta, Spain in December 2000 (see Leo Blockley Memorial Campaign), and on the rec.sport.rowing newsgroup.
"Boats constructed after 1st April 2003 must have inherent buoyancy sufficient, together with their oars and sculls, to support a seated crew of the correct design weight in the event of being swamped."
The key principles here are to ensure that a) the crew members (including the cox) are supported out of the water to minimise the risk of hypothermia, and b) to provide the boat with sufficient clearance for the gates so that the crew have an opportunity to row towards safety.
www.packer.dsl.pipex.com /rowing/safety/buoyancy.html   (589 words)

 Science Experiment - Floating Boats (principle of floatation)
Buoyancy is the loss in weight an object seems to undergo when placed in a liquid, as compared to its weight in air.
Well, it all has to do with how much water is pushing against you and a little scientific principle called buoyancy or floatation.
Archimedes' principle states that an object fully or partly immersed in a liquid is buoyed upward by a force equal to the weight of the liquid displaced by that object.
www.spartechsoftware.com /reeko/Experiments/floating.htm   (484 words)

 Cressi-Sub Recall of SCUBA Buoyancy Compensators
Buoyancy Compensator devices with a black retaining ring around the yellow inflate button on the inflation mechanism, and an adjoining gray cover assembly (bypass case), which screws onto the inflator, are subject to this recall and must be retro-fitted.
Description: Buoyancy Compensator devices provide buoyancy control for scuba divers by allowing them to inflate or deflate the devices.
The recalled buoyancy compensators have model numbers J107, J113, J115, and J119.
www.cpsc.gov /cpscpub/prerel/prhtml05/05121.html   (265 words)

 Scuba Diving Training and Safety for the New Diver
Perfect neutral buoyancy is difficult to maintain, especially when diving with a wetsuit, because minor depth changes alter both the suit's and the BC's compression.
The ability to achieve neutral buoyancy is one of diving's most important skills.
A neutral, relaxed diver is more efficient and uses less air than a diver who constantly struggles against positive or negative buoyancy.
www.newdiver.com /training/insidertips/getneutral.shtml   (221 words)

 PFD Definitions
Most require only about 11 pounds (50 Newtons) of extra buoyancy to keep their head out of water.
That is why a PFD with just 15.5 pounds (70 Newtons) of buoyancy can provide adequate flotation for an adult -- even a very large person.
Heavy people do not need a higher buoyancy PFD because of their weight.
www.uscg.mil /hq/gm/MSE4/pfddefinition.htm   (732 words)

 Scuba Diving Safety, Buoyancy control, buoyancy compensators, breathing control, breath control, and body control - Scuba Diving Certifications, Learn how to scuba dive - Philadelphia Pa dive shops, Philadelphia Scuba Stores
The buoyancy compensator is used for gross changes in buoyancy.
First of all, there is your buoyancy compensator, which is what most people think about when we talk buoyancy.
Read on and then gather up your gear and go out and practice because if the last time you practiced buoyancy control was during your basic course, I can assure you that your buoyancy control leaves a lot to be desired.
ygraine.membrane.com /enterhtml/live/scuba/safety.html   (3346 words)

 Pacific NW Scuba - Vancouver Washington / Portland Oregon - Peak Performance Buoyancy
The elective Peak Performance Buoyancy dive conducted during your AOW class may be counted as 1 of the 2 dives at the instructor's discretion.
This class is great for the beginner who is still working on his or her buoyancy skills, and also great for those who want to fine tune his or her weighting systems for specialized activities or work on reducing the current amount of weight worn!
This class is interactive, fun, and gives you the opportunity to work on your buoyancy.
www.pnwscuba.com /classes/ppb.htm   (334 words)

The following calculator allows you to input the volume of material that is displaced, its density, and the calculator provides the buoyancy force.
If the van floats then the buoyancy force equals the weight of the van.
This works for water with a density of 62.4 pounds per cubic foot as well as other liquids and even gases such as cool air.
www.grow.arizona.edu /water/buoyancy/vanbuoyancy.shtml   (370 words)

 Buoyant force in liquids
This Java applet shows a simple experiment concerning the buoyancy in a liquid: A solid body hanging from a spring balance is dipped into a liquid (by dragging the mouse!).
In this case the measured force, which is equal to the difference of weight and buoyant force, is reduced.
The buoyant force is equal to the weight of the replaced liquid or gas.
www.walter-fendt.de /ph11e/buoyforce.htm   (133 words)

Muted Revival: Despite buoyancy in the secondary market, the appetite for primary issues is yet to become broad based
The polls: searching for determinism: a comparative assessment of first term approval volatility, buoyancy, and polarization.
buoyancy, upward force exerted by a fluid on any body immersed in it.
www.infoplease.com /ce6/sci/A0809461.html   (159 words)

 The Golden Crown (Introduction)
Second, it does not make use of Archimedes&; Law of Buoyancy or his Law of the Lever.
more imaginative and practical technique to detect the fraud is the following, which makes use of both Archimedes&; Law of Buoyancy and his Law of the Lever.
Additionally, the change in water level would be even less than 0.41 millimeters if the wreath had a mass of less than 1000 grams, or if the diameter of the container opening were larger than 20 centimeters, or if less than 30% of the gold were replaced with silver.
www.mcs.drexel.edu /~crorres/Archimedes/Crown/CrownIntro.html   (1114 words)

 Buoyancy Aids, Pfds and Life Jackets from Kayaks and Paddles Canoe Shop
Buoyancy Aids and PFD's for canoeing and kayaking for sale from our shop and by mail order in the UK and overseas.
With higher buoyancy, chest harness, more robustly built and more features which WW paddlers require.
Designed for those entering the canoeing and kayaking scene and looking for a good quality buoyancy aid or looking for a PFD for centre use.
www.kayaksandpaddles.co.uk /canoe/kayak/uk/shop/pfds.htm   (162 words)

 Cheryl's Herbs Herbal and Aromatherapy Encyclopedia
Euphoriant/Euphorigen Induces an abnormal sense of vigor and buoyancy.
Female correctives for the reproductive organs, which stimulate and promote a normal menstrual function, flow and discharge.
Exanthematous Healing skin eruptions or skin diseases of an eruptive nature.
www.cherylsherbs.com /encyclopedia.htm   (1822 words)

 Buoyancy - buoyancy. The Columbia Encyclopedia, Sixth Edition. 2001-05
Buoyancy Image After researching about buoyancy on the Web, students create their own Learn key terms and concepts related to the study of buoyancy,
DIVERNET - Buoyancy for beginners - June 2004
The tendency or capacity to remain afloat in a liquid or rise in air or gas.
xihutv.com /xhtv/buoyancy.html   (184 words)

Perpetual motion machine inventors are fascinated by buoyancy, supposing that buoyancy has some "magical" ability to produce motion against gravity without expenditure of energy.
Textbook treatments of buoyancy are usually based on Archimedes principle: "A body immersed in a liquid experiences an upward force due to the liquid, of a size equal to the weight of the displaced liquid." A more insightful (but equivalent) treatment goes like this:
You may indeed get a boost from the imbalance of mass, but in a cyclic process that mass must be moved back to where it started to repeat the cycle, and that's where you lose what you gained.
www.lhup.edu /~dsimanek/museum/themes/buoyant.htm   (2046 words)

 Life Jackets UK - Lifejackets and Buoyancy Aids by mail order
A lifejacket, vest or buoyancy aid is an essential safety item for all watersports and water-related and near-water activities.
Suppliers of life jackets and buoyancy aids from the UK.
Have fun and be safe on the water with products for sailing, boating, canoeing, water skiing and jetskis, diving, fishing, work and not forgetting the children and the dog.
www.lifejackets-uk.co.uk   (105 words)

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